EP0292765B1 - Méthode pour souder des membranes imperméables dans des murs enterrés - Google Patents

Méthode pour souder des membranes imperméables dans des murs enterrés Download PDF

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Publication number
EP0292765B1
EP0292765B1 EP88107391A EP88107391A EP0292765B1 EP 0292765 B1 EP0292765 B1 EP 0292765B1 EP 88107391 A EP88107391 A EP 88107391A EP 88107391 A EP88107391 A EP 88107391A EP 0292765 B1 EP0292765 B1 EP 0292765B1
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EP
European Patent Office
Prior art keywords
housing
welding
bentonite
earth
sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88107391A
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German (de)
English (en)
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EP0292765A1 (fr
Inventor
Aloys Schlütter
Klaus Kaewert
Christian Witolla
Bernd Kopp
Hans-Jürgen Rösler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Naue Fasertechnik GmbH and Co KG
Original Assignee
Huels Troisdorf AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19873717999 external-priority patent/DE3717999A1/de
Application filed by Huels Troisdorf AG filed Critical Huels Troisdorf AG
Priority to AT88107391T priority Critical patent/ATE94240T1/de
Publication of EP0292765A1 publication Critical patent/EP0292765A1/fr
Application granted granted Critical
Publication of EP0292765B1 publication Critical patent/EP0292765B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
    • E02D19/185—Joints between sheets constituting the sealing aprons
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/06—Restraining of underground water
    • E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material

Definitions

  • the invention relates to a method for welding sealing sheets in diaphragm walls with bentonite fillings, and a device for carrying out the method.
  • Diaphragm walls are of great importance for the sealing of water-bearing containers or the sealing of water-bearing layers.
  • Diaphragm walls are created by excavating earth slits while filling them with supporting materials such as bentonite.
  • the bentonite can also be a solidifying agent, e.g. B. cement can be added.
  • Such diaphragm walls offer a certain degree of sealing.
  • the diaphragm walls are provided with sealing sheets. The sealing strips are lowered into the bentonite sludge. This poses the problem of connecting the sealing sheets at their edges.
  • a variety of proposals have been made in the past for joining the web edges.
  • the edge of the long waterproofing membranes should be connected to each other by overlapping seams or web seams using tried and tested welding equipment and technology.
  • it was provided to surround the overlap area of the sealing sheets with a two-part housing, one housing part on one side of the web and the other housing part on is assigned to the other side of the track.
  • the housing parts have seals in the area of contact with the sealing membrane and are pumped empty, so that the overlapping membrane edges are easily accessible for cleaning and welding.
  • the application of the housing including flushing and emptying had been regarded as so complex that the application only seemed to be restricted to extremely long sealing sheets.
  • the invention has for its object to conventionally weld narrow sealing sheets in earth slots.
  • the invention is based on a housing spanning the overlap area on both sides of the webs.
  • the housing spanning the overlap area is subjected to a vacuum after positioning.
  • the vacuum is created by suction pumps with the appropriate suction power.
  • the negative pressure causes the housing to lie against the webs and the ambient pressure supports the closing process of the housing and the seal.
  • the invention uses method steps (a-b-d-f-g) which are already known from DE-A-3 428 297, which corresponds to the closest prior art.
  • devices are used for welding according to the invention, which clamp the web edges between them, so that the welding device is guided on the web edges or the welding device fixes the web edges in the intended welding position.
  • welding devices with forward run and reverse run are used, the device being placed on the top after the pumping out of the housing spanning the overlap region and flushing of the welding surfaces and passing through downwards. The welding process then only starts with the reverse run from below.
  • An ultrasound test is also provided for the inspection of the weld seam.
  • the device commercially available for ultrasonic testing has very small dimensions, so that together with the o.b.
  • the welding machine has a space requirement of no more than 200 mm x 200 mm for the housing. As a result, the housing can be used in earth slots without an earth slot widening at the housing location.
  • a device with the features of claim 6 is provided for carrying out the inventive method described above.
  • Earth slots are made in sections. Each section has a max. Length from 5 to 6 m.
  • the max. Length depends on the chosen support medium. That is, with increasing bentonite content in the bentonite suspension, the max. Length of the diaphragm wall section. On the other hand, it worsens with increasing Bentonite portion the handling of the bentonite suspension. Both the amount of bentonite suspension is extremely difficult, as well as pumping it and lowering the waterproofing membrane with the necessary equipment.
  • each diaphragm wall section finished with sealing sheets is first solidified before the diaphragm wall section adjoining it is started.
  • the overlap area of the sealing sheets must be excluded from the consolidation, since otherwise the sealing sheets can no longer be connected.
  • bulkheads are used for this. The bulkheads are drawn in in a vertical direction so that they close off the earth slot area at the edge of the sheet against the other earth slot filled with bentonite suspension. This can be used in different ways.
  • the bulkheads are formed by at least two hoses, one of which is arranged on each side of the track.
  • the tubes are located - seen in the horizontal - at one end of the preferably two-part housing.
  • a hose is then provided on each half of the housing.
  • the hoses are pumped up, this can be done relatively quickly with water.
  • the hoses block the earth slot due to a correspondingly large hose diameter, on the one hand enclosing the sealing membrane between them and on the other hand being supported on the surrounding soil.
  • the hoses unfold the surprising and very advantageous effect of securing the housing parts against buoyancy when the housing is pumped empty.
  • the membrane edges are accessible for a rinsing process or for the intended welding process.
  • the above Supporting the hoses in the earth slot necessitates hose diameters, which in total exceed the earth slot width.
  • the sum is preferably at least 10% larger than the earth slot width.
  • Rubber is a suitable material for the hoses. When the pressure hoses are relieved of pressure, the rubber easily detaches from the bentonite, which has solidified in the meantime. It is preferably provided that the hoses are attached in such a way that they protect the housing from the bentonite provided with solidifying agent.
  • the housing should be composed of individual sections.
  • the sections are connected by screws or quick-release fasteners.
  • the hoses then consist of individual sections which are coupled together.
  • the hoses are located at the sections and are put together with the sections assembled. Screw connections or quick-release fasteners serve as coupling pieces for the hoses.
  • at least one of the hose sections protrudes relative to the associated housing section at the connection point between two housing sections, so that the hoses can slip into one another at the connection point and can cover the connection point or the coupling piece. This is facilitated by a coupling piece, the outside diameter of which is smaller than the inside diameter of the hose.
  • the protruding excess length of the hose section is at least equal to the length of the coupling piece.
  • connection of the housing parts is effected by the liquid pressure of the bentonite suspension column. According to the invention, this can be achieved in such a way that after the housing has been introduced into the earth slot, the upper housing sections are pressed against one another and bentonite suspension is pumped out from above. Even with a slight difference in the height of the suspension level in the housing compared to the surrounding bentonite suspension level, the surrounding bentonite suspension develops so much contact pressure that the housing parts continue to contact one another like a zipper, starting from the top edge downwards. This process allows the bentonite suspension to flow in relatively slowly through open gaps, unlike water.
  • the height difference required for the closing movement between the bentonite suspension levels in the housing and outside the housing can be easily produced using commercially available pumps.
  • a height difference of 0.5 m is usually sufficient. However, 0.3 m may already be sufficient.
  • the pump required to generate the height difference should not be immersed more than 1 m in the bentonite suspension in the housing.
  • the closing movement of the housing can also be supported by electromagnets.
  • electromagnets in the side cheeks of the housings, which seal the sealing sheets between them. It is advantageous if the electromagnets reach up to the sealing membrane. Then the force required to attract the opposite housing part is smaller due to the smaller gap width than with a magnet arrangement on the side cheek on the side facing away from the sealing membrane.
  • the electromagnets can be arranged in a pump shape in a uniform distribution along the length of the side cheeks of the housing. A linear or rod-shaped magnet arrangement can also be considered.
  • the electromagnets individually or in succession. That is, As soon as the gap between the side cheeks of the housing that forms the sealing surfaces is closed on a magnet, the power supply to this magnet is either completely switched off or throttled and at the same time the next magnet is activated, in which there is still a gap between the sealing surfaces of the side cheeks.
  • the magnets are individually provided with a power supply.
  • the sealing surfaces are designed so wide that the sealing surfaces come into contact with one another despite the shift in position.
  • the sealing surfaces can also be narrow.
  • a centering of the housing parts is then additionally provided in order to ensure that the housing parts are placed precisely against one another. The centering can be achieved, for example, by a clever shaping of the side cheeks. Such a shape is created with bead-shaped deformation in the area of the side cheeks. The bead-shaped deformation causes the housing parts to self-center. When placed against one another, the housing half is then guided with a bulge in a corresponding recess in the other housing half.
  • the webs are e.g. B. welded.
  • the housing parts can form part of the device provided for lowering the sealing sheets.
  • the housing parts then preferably form the side bolsters of the lowering device.
  • the housing parts together with the sealing sheets are forcibly positioned. I.e. the housing parts are introduced together with the waterproofing membrane. This is done by pulling the sealing membrane from a roll that is set up next to the earth slot and with the help of a crane that lowers the lowering device into the bentonite suspension.
  • the lowering device is assembled in sections. After the section of the lowering device forming the lower part has been immersed in the bentonite suspension, the subsequent section is assembled with the housing sections forming the side cheeks of the device. Then the lowering continues until this section of the lowering device is also immersed in the bentonite suspension. The immersion is followed by the assembly of the next section of the lowering device and its immersion. This continues until the lowering device has reached the bottom of the earth slot.
  • the earth slot is finished with a length corresponding to the length of the waterproofing membrane and the waterproofing membranes are laid parallel to the earth slot so that they overlap at the edges.
  • the sealing sheets are then welded together outside the earth slot.
  • Test seams can be welded easily. Test seams are parallel weld seams in the overlap area of the webs. There is a channel between the parallel weld seams, which shows that the weld seams are tight by holding a pressurized air. A normal air pressure is 2 bar.
  • the sealing tarpaulin thus created is moved into the earth slot transversely to the longitudinal direction of the individual sealing sheets. This happens in sections Welding a new waterproofing membrane.
  • the resulting seal When lowering, the resulting seal is resiliently held on the edge facing away from the earth slot. This ensures that the seal does not sink into the earth slot in an unforeseen manner.
  • the weld seam is placed at a slight distance from the edge of each sealing membrane. 20 mm free edge strips of a waterproofing membrane can be sufficient for a bracket.
  • the ends of the plastic seal are welded to one another in such a way that the ends are exposed, possibly cleaned and then welded to one another using conventional welding equipment to produce a standing seam or an overlap seam.
  • Overlap seams are an advantage.
  • the handling according to the invention is for long seals, for. B. 60 m long seals or much longer seals is an advantage.
  • a crossmember is attached to the lower edge of the seal in a manner known per se.
  • the traverse can be in one piece, can also be composed of several elements.
  • the modular design is advantageous if there are different diaphragm wall lengths.
  • the crosshead is so heavy that a lowering of the plastic seal in the bentonite is guaranteed.
  • the traverse with at least two traction means for. B. ropes or chains, which can be moved independently and together. This allows the lowering movement of the crossbeam to be controlled.
  • a control in the longitudinal direction of the plastic seal or in the longitudinal direction of the earth slot is preferably additionally provided.
  • This control option consists of diagonally acting traction devices. With these diagonally acting traction devices, optionally again ropes or chains, any deviation of the vertical sealing membrane edge from the predetermined edge position can be prevented.
  • the web ends are received by a housing when lowering.
  • the housing is filled with bentonite.
  • the slot in the housing encompassing the plastic seal is closed.
  • the application of hydraulic fluid is of particular advantage. Only a little pressure is required. The pressure applied to the top of the housing or the pressure applied to the hose continues as a pressure difference down to the bottom. The same contact conditions arise everywhere, unlike when air pressure is applied.
  • the housing can be removed after welding. However, the housing can also remain as an inspection shaft.
  • a welding platform is provided for carrying out the diaphragm wall sealing according to the invention, on which the welding of the sealing sheets laid parallel to the diaphragm wall takes place.
  • the welding platform ensures that the sealing sheets do not become dirty at the welding points.
  • Tie rods and pliers are used to capture the web edges outside the earth slot.
  • the welding platform preferably has recesses for the tie rods, so that the devices used for welding the sealing sheets do not find any resistance on the protruding tie rods.
  • an earth slot of 400 mm width is designated.
  • the earth slot 11 is 30 m deep.
  • the earth slot 11 has been produced while backfilling with bentonite mud.
  • 11 sealing sheets 12 and 13 have been lowered into the earth slot.
  • the sealing sheets 12 and 13 have been lowered so that they overlap one another at the edge.
  • housing halves 14 and 15 are provided which span the overlap area.
  • the housing halves 14 and 15 have seals 16 at the point of contact with the sealing sheets 14 and 15.
  • the housing halves 14 and 15 consist of U-shaped steel profiles, which together form a cavity of 200 mm x 200 mm.
  • the cavity is sufficient to insert a suction line into the housing and to generate a sudden vacuum in the housing space while applying high suction power.
  • the excess pressure which arises outside the housing interior causes the housing halves to be placed against the sealing sheets 12 and 13.
  • the housing interior can be pumped empty.
  • the waterproofing membranes in the overlap area are rinsed with water, the rinsing water is pumped out and a conventional welding device with forward and reverse running is attached from above.
  • the welding device first moves to the bottom of the slot. There the welding device is given contact to retract a heating wedge. You can also choose to weld with hot air.
  • the welding process starts with reverse running at the same time. Then the overlap area is closed from bottom to top. At the same time, the weld seam is checked with ultrasound. This is done using a test head attached to the welding device. The test head is located behind the welding device in the welding direction.
  • hoses 106 and 107 are mounted on the side cheeks 114.
  • the hoses 106 and 107 are made of rubber-coated fabric.
  • the hoses 106 and 107 can e.g. B. with terminal strips on the side walls 114.
  • the hoses 106 and 107 are clamped between the terminal strips and the side cheeks 114.
  • the clamping strips allow the use of cuts which are only formed when they are assembled on the side walls 114 by folding and clamping to form tubes.
  • the diameter of the hoses 106 and 107 is to be dimensioned such that the sum of the diameters is 1.5 times and the distance between the earth slot walls 1.
  • the hoses 106 and 107 are closed at the foot 116. This can be done by clamping. Optionally, the tubes 106 and 107 are also clamped at the upper end. A valve for filling the hoses 106 and 107 with hydraulic fluid is also integrated in the clamp. When the hydraulic fluid is pumped in, the hoses 106 and 107 bulge, press against the earth slot walls 101 and clamp the sealing membrane 105 and the side cheeks 114 of the housing halves 109 and 110 between them. The hoses 106 and 107 overlap with respect to the housing halves 109 and 110 or the side cheeks 114, so that the space 102 of the earth slot is sealed off with respect to the housing halves 109 and 110 and the overlap area.
  • bentonite suspension was also filled into the earth slot.
  • the bentonite suspension has been mixed with cement so that one in the area 102 of the earth slot Consolidation occurs.
  • the earth slot is made in sections. When area 102 was excavated, the earth slot was excavated to a length, the boundary of which is shown in dash-dot lines at 117 in FIG. 3. This boundary lies in the slot area 103. After the earth slot section for the earth slot area or for the space 102 has been excavated up to the border 117 and at the same time filled with bentonite suspension, the sealing membrane 105 has been introduced. The housing halves 109 and 110 were then lowered with hoses 106 and 107 on both sides of the sealing membrane 105.
  • a retarder is injected into the bentonite suspension, which is located in the area of the earth slot from the hoses 106 and 107 to the boundary 117.
  • the retarder prevents the bentonite suspension from solidifying. This is necessary in order to create the subsequent earth slot section for the earth slot area 103, following the sealing membrane 104.
  • the interior of the housing 109, 110 is pumped empty.
  • a submersible pump is suitable for this, which is placed on the suspension level in the housing and dips into the bentonite suspension with its suction pipe and has only a short suction path for the bentonite suspension. The pump then presses the bentonite suspension through a pipe into a collecting container.
  • pumping out the housing 109, 110 after reaching a height difference of 0.4 m between the suspension level inside the housing and outside the housing 109, 110 causes the housing halves 109 and 110 to be pressed against one another by the suspension pressure.
  • the housing halves 109 and 110 close the sealing sheets 104 and 105 sealing between them.
  • the sealing membrane 104 After completion of the earth slot section for the earth slot area 103, the sealing membrane 104 has been lowered into the earth slot before the pumping process begins.
  • the sealing strips 104 and 105 advantageously also form seals for the housing 109 and 110.
  • the housing 109 and 110 is closed at the foot 112.
  • the housing halves 109 and 110 are provided with a base plate.
  • the hoses 106 and 107 hold the housing in the intended position against the buoyancy forces acting from pumping the housing 109, 110 due to their contact pressure against the earth slot walls 101.
  • the overlapping web edges are rinsed with water.
  • the water is pumped out by the pump that is still on the base of the housing.
  • a welding device is then attached to the top of the sealing sheets 104 and 105, which surrounds the overlapping sheet edges with guide rollers and is first moved to the foot of the housing by a drive roller before the welding process is started.
  • the device then welds the overlapping web edges together on their way back upwards.
  • Commercially available welding devices are suitable for this welding process, as are customary for overlapping seams on sealing sheets on roofs.
  • the housing 109, 110 is again flooded with suspension, the hoses 106 and 107 are relieved.
  • the housing halves 109 and 110 can be pulled out of the earth slot again after the relief.
  • Figure 4 shows a housing for earth slots with special depth.
  • the housing consists of sections 120 which are provided with collars 121 at their contact points and are screwed together there.
  • quick fasteners e.g. B. with clamping lever can be used.
  • FIGS. 5 and 6 show housing sections 125 with side cheeks 126.
  • the side cheeks 126 are provided with bores for magnets 127.
  • the magnets are arranged evenly distributed over the length of the side cheeks 126.
  • the magnets 127 can be supplied with current via lines 128.
  • the magnets 127 can be controlled individually. This serves to support the closing movement of the housing halves in a further exemplary embodiment of the invention. After current has been applied to the magnets 127, the magnets 127 arranged on the housing section 125 attract the opposite housing section made of steel.
  • FIG. 7 shows, in a further exemplary embodiment, self-centering housing halves 130 and 131.
  • the housing halves 130 and 131 have side cheeks 132 and 133.
  • the side cheeks 132 are provided with bead-shaped bulges 134, the side cheeks 133 with inward bulges 135.
  • the bulges 134 and 135 are shaped in such a way that that they close together.
  • the sealing sheets clamped between the housing halves 130 and 131 in the exemplary embodiment according to FIG. 7 are designated 136 and 137.
  • the advantage of the bulges 134 and inward bulges 135 lies in the centering or guiding of the housing halves 130 and 131 when the housing is closed.
  • FIG. 8 shows an exemplary embodiment of the invention with a sealing membrane 140 and housing halves 141 which are provided with side cheeks 142, the sealing membrane 140 being provided with a welded-on web 143.
  • the web 143 slides in a groove 144 of the side cheek 142.
  • the web has a height of 10 mm in the exemplary embodiment.
  • the groove 144 is created by bending the side cheek 142 or by a suitable welded construction.
  • the web 143 and the groove 144 form a guide for the web 140.
  • FIG. 9 shows an earth slot with slot walls 150 and 151.
  • area 152 the bentonite suspension has already been solidified by admixed cement, while in area 153, the filled bentonite suspension has not yet been solidified.
  • hoses have been used to delimit regions 152 and 153. The hoses are shown in dash-dot lines in FIG. 9 and designated 154.
  • the hoses 154 are fastened to the housing halves 155 and 156, which in addition to the side cheeks 157 also have guides 158.
  • the guides 158 are each formed by a side wall and a web 159 and bends 160 at the end of the web 159 or at the end of the associated side wall 157.
  • a frame part of the lowering device for the sealing sheets engages in the guide 158 with a T-shaped head 161.
  • This part of the lowering device is designated 162 and is provided on the side of the sealing sheet with a sheet-shaped support 163 for the sealing sheet or formed by a lattice structure.
  • the edition is shown in Figure 10. It can also be seen from FIG. 10 that the device for lowering the sealing membrane has a clamping strip 164 at the foot.
  • the terminal block 164 is actuated electromechanically and clamps the lower edge of the sealing sheet to be drawn in.
  • the part 162 consists of a lattice construction, which is optionally stiffened by diagonally running struts.
  • the earth slot in area 152 has been completed with a sealing membrane 165.
  • the housing halves 155 and 156 are open, so that the sealing sheet designated 166 can be lowered with the lowering device.
  • the head 161 slides in the guide 158, while the support 163 with the clamping strip 164 is threaded with the sealing membrane between the two housing halves 155 and 156.
  • a displacement of the housing half 155 can occur can be prevented by the hoses 154.
  • the lowering process with part 162 also lowers the housing half 155 for the next overlap area.
  • the housing half 155 for the next overlap area is screwed or clamped to the part 162 in a manner not shown.
  • the interior of the housing 155, 156 is pumped empty and the sealing sheets 165 and 166 are welded in their overlap area as in the exemplary embodiment according to FIGS. 2 and 3. Then the housing 155, 156 is flooded with bentonite suspension and that Part 162 with the housing half 155 of the just welded overlap area is pulled out of the earth slot, while the housing half 155 remains in the earth slot for the overlap area to be subsequently welded by loosening the screw connection or clamping connection previously provided. In contrast, the housing 155 of the just welded overlap area is screwed or clamped to the part 162 for extraction.
  • the housing half 156 opposite the housing half 155 is either pulled out together with the part 162 and the housing half 155 or separately.
  • the sealing sheet 166 When the sealing sheet 166 is introduced, the sealing sheet 166 is pulled from a roll which has been set up on the side 167 of the earth slot.
  • the membrane roll is arranged on page 168.
  • Part 162 is used again, but in a position pivoted by 180 degrees, which is designated by dashed lines in FIG. 9 for sealing membrane 165 by 169.
  • the housing parts 170 and 171 are lowered into the earth slot before the sealing sheets are lowered. I.e. the sealing sheets are then drawn in between the housing parts 170 and 171.
  • the prerequisite is that the housing parts leave a sufficient gap.
  • the gap width must be at least equal to the thickness of the waterproofing membrane.
  • the gap width is preferably substantially larger.
  • the housing parts 170 and 171 are held at the bottom by bolts 176.
  • the bolts give the housing parts 170 and 171 sufficient play and are loosened before the housing parts 170 and 171 are pulled out after the overlapping web edges have been welded together.
  • the housing parts 170 and 171 are composed of folded profiles 172 and 173 and floor plates 174 and 175.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
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  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Claims (15)

  1. Procédé pour souder des membranes d'étanchéité (2, 3, 104, 105 ; 136, 137 ; 140 ; 165, 166) à l'intérieur de tranchées (1 ; 101) remplies de bentonite, dans lequel
    a. on réalise une tranchée (1 ; 101) remplie de bentonite ;
    b. on abaisse dans la tranchée, en direction longitudinale, un caisson constitué de deux moitiés (4, 5; 109, 110 ; 130, 131 ; 141, 142 ; 155, 156) lequel recouvre la zone de chevauchement des membranes à souder le long de la profondeur du mur enterré ;
    c. on introduit les demi-caissons (4, 5 ; 109, 110 ; 130, 131 ; 141, 142 ; 155, 156) dans la tranchée (1; 101) de telle manière que la suspension de bentonite soit présente partout sur la face latérale du caisson ( 4, 5 ; 109, 110 ; 130, 131 ; 141, 142 ; 155, 156) ;
    d. on introduit les membranes (2, 3 ; 104, 105 ; 136, 137, 138 ; 140 ; 165, 166) entre les demi-caissons (4, 5 ; 109, 110 ; 130, 131 ; 141, 142 ; 155, 156);
    e) au moyen d'une pompe, à forte puissance d'aspiration, destinée à pomper la bentonite se trouvant à l'intérieur du caisson (4, 5 ; 109, 110 ; 130, 131 ; 141, 142 ; 155, 156), on établit à l'intérieur du caisson une pression négative instantanée afin de fermer les deux moitiés de celui-ci (4, 5 ; 109, 110 ; 130, 131 ; 141, 142; 155, 156) ;
    f. on soude les membranes (2, 3 ; 104, 105 ; 136, 137 ; 140 ; 165, 166) ; et
    g. on extrait les demi-caissons (4, 5 ; 109, 110 ; 130, 131 ; 141, 142 ; 155, 156 ).
  2. Procédé selon la revendication 1, caractérisé en ce que les demi-caissons (4, 5 ; 109, 110 ; 130, 131; 141, 142 ; 155, 156) subissent un pompage à vide par le haut et en ce que la conduite d'aspiration pénètre dans la suspension de bentonite à une profondeur ne dépassant par un mètre.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on utilise des dispositifs de soudage comportant des rouleaux à marche avant et marche arrière qui tendent les bords des membranes entre elles, ledit dispositif de soudage étant monté par le haut et déplacé vers le bas sans effectuer de soudure, cette dernière étant réalisée lors de la marche arrière de bas en haut.
  4. Procédé selon la revendication 3, caractérisé en ce qu'on effectue un contrôle aux ultrasons de la soudure réalisée.
  5. Procédé selon l'une ou plusieurs des revendications 1 à 4, caractérisé en ce qu'on utilise un caisson qui est composé, dans le sens vertical, de plusieurs sections individuelles (120).
  6. Dispositif pour la mise en oeuvre du procédé selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce que le caisson (109, 110, 155, 156) formé de deux moitiés constitue en même temps une paroi étanche fermant la tranchée dans le sens vertical et qu'il est composé, dans le sens vertical, de plusieurs sections individuelles (120), les joues latérales (132, 133) des demi-caissons permettant un auto-centrage en vue de l'alignement mutuel des deux demi-caissons et une rainure (144) destinée à recevoir les bords des membranes (2, 3, 104, 105, 136, 137, 140, 165, 166) munis d'une barrette de guidage 143 étant associée auxdites joues latérales (132, 133).
  7. Dispositif selon la revendication 6, caractérisé en ce que les parties de caisson (109, 110) peuvent être munies à leur extrémité (114) de tuyaux (108, 109, 154) gonflables par pompage, tandis que sur chacun des deux côtés de la membrane est disposé un tuyau (106, 107, 154), la somme des diamètres de ces tuyaux (106, 107, 154) étant supérieure à la distance entre les parois de la tranchée.
  8. Dispositif selon les revendications 6 et 7 caractérisé en ce que les tuyaux (106, 107, 154) de plusieurs sections de caisson peuvent être accouplés les uns aux autres et en ce qu'au moins une extrémité de tuyau fait saillie par rapport à la section de caisson concernée et en ce que les raccords d'accouplement ont un diamètre qui est inférieur au diamètre intérieur du tuyau.
  9. Dispositif selon la revendication 7 ou 6, caractérisé en ce que les tuyaux (106, 107, 154) sont garnis d'au moins une enduction en caoutchouc.
  10. Dispositif selon la revendication 7, caractérisé en ce que les sections de tuyaux sont assemblées mutuellement par vissage.
  11. Dispositif selon la revendication 6, caractérisé en ce que les sections de caisson (126) sont équipées d'électro-aimants (127).
  12. Dispositif selon la revendication 11, caractérisé en ce que les électro-aimants (127) peuvent être commandés séparément.
  13. Dispositif selon l'une ou plusieurs des revendications 6 à 12, caractérisé en ce que les joues latérales des caissons (130, 131) s'interpénètrent.
  14. Dispositif selon l'une ou plusieurs des revendications 6 à 13, caractérisé en ce que les membranes d'étanchéité (140) sont guidées dans les caissons (141) à l'aide de barrettes (143).
  15. Dispositif selon la revendication 6, caractérisé en ce que les parties de caisson (155, 156) forment les joues latérales du dispositif d'abaissement dans la tranchée.
EP88107391A 1987-05-29 1988-05-07 Méthode pour souder des membranes imperméables dans des murs enterrés Expired - Lifetime EP0292765B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88107391T ATE94240T1 (de) 1987-05-29 1988-05-07 Verfahren zum verschweissen von abdichtungsbahnen in schlitzwaenden.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3717999 1987-05-29
DE19873717999 DE3717999A1 (de) 1987-05-29 1987-05-29 Verfahren zum verschweissen von abdichtungsbahnen in schlitzwaenden
DE19873720670 DE3720670A1 (de) 1987-05-29 1987-06-23 Verfahren und vorrichtung zum ueberlappenden schweissen von abdichtungsbahnen in erdschlitzen
DE3720670 1987-06-23

Publications (2)

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EP0292765A1 EP0292765A1 (fr) 1988-11-30
EP0292765B1 true EP0292765B1 (fr) 1993-09-08

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EP88107391A Expired - Lifetime EP0292765B1 (fr) 1987-05-29 1988-05-07 Méthode pour souder des membranes imperméables dans des murs enterrés

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US (1) US4900195A (fr)
EP (1) EP0292765B1 (fr)
JP (1) JPS646417A (fr)
DE (2) DE3720670A1 (fr)

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DE3825728A1 (de) * 1988-07-28 1990-02-01 Bauer Spezialtiefbau Verfahren zum entleeren einer fuehrung fuer eine membran und vorrichtung zur durchfuehrung des verfahrens
CH678932A5 (fr) * 1989-05-24 1991-11-29 Sarna Kunststoff Ag
DE3929683A1 (de) * 1989-09-07 1991-03-14 Niederberg Chemie Verfahren zur herstellung eines hohlraumes
GB2258486A (en) * 1991-06-27 1993-02-10 Keller Ltd A panel for a subsurface barrier screen
DE4213585A1 (de) * 1992-04-24 1993-10-28 Siemens Ag Überwachungseinrichtung für eine Mülldeponie und Verfahren zur Leckageortung
NL1015163C2 (nl) * 2000-05-12 2001-11-15 Hollandsche Betongroep Nv Werkwijze voor het aanbrengen van een scherm in de grond.
CN109252532B (zh) * 2018-08-09 2021-08-31 贾秀堃 一种地下连续墙端头用可伸缩封头箱
CN110424433A (zh) * 2019-07-12 2019-11-08 广州穗岩土木科技股份有限公司 一种地下连续墙接头柔性止水带安装装置及方法

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Also Published As

Publication number Publication date
DE3720670A1 (de) 1989-01-12
DE3883845D1 (de) 1993-10-14
US4900195A (en) 1990-02-13
EP0292765A1 (fr) 1988-11-30
JPS646417A (en) 1989-01-11

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